VALUE Attribute | value参数属性

Sets or retrieves the default or selected value of the control.

dhtml语法

HTML <ELEMENT VALUE = sValue... >
Scripting object.value [ = sValue ]

DHTML可能的值

sValue String that specifies or receives the value for the control.
The property is read/write. The property has no default value for all objects with the following exceptions:
input type=checkbox on
input type=reset reset
input type=submit submit query
expressions can be used in place of the preceding value(s), as of microsoft® internet explorer 5. for more information, see about dynamic properties.

Remarks

The purpose of the value property depends on the type of control as described in the following table.
input type=checkbox the selected value. the control submits this value only if the user has selected the control. otherwise, the control submits no value.
input type=file the value, a file name, typed by the user into the control. unlike other controls, this value is read-only.
input type=hidden the value that the control submits when the form is submitted.
option the selected value. the containing list box control submits this value only if the user has selected the option.
input type=password the default value. the control displays this value when it is first created and when the user clicks the reset button.
input type=radio the selected value. the control submits this value only if the user has selected the control. otherwise, the control submits no value.
input type=reset the button label. if not set, the label defaults to reset.
input type=submit the button label. if not set, the label defaults to submit.
input type=text the default value. the control displays this value when it is first created and when the user clicks the reset button.

是否符合公共标准

This property is defined in HTML 4.0 and is defined in World Wide Web Consortium (W3C) Document Object Model (DOM) Level 1 .

Applies To

BUTTON, INPUT, INPUT type=checkbox, INPUT type=hidden, INPUT type=button, INPUT type=radio, INPUT type=reset, INPUT type=submit

更多语法参考

button, input